La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Mortality in the endangered Laysan Teal Anas laysanensis: conservation implications
Auteurs :	M. H. Reynolds, Auteur ; T. M. Work, Auteur
Type de document :	Article
Dans :	Wildfowl (55 2005)
Article en page(s) :	29-46
Langues:	Anglais
Résumé :	The Laysan Teal Anas laysanensis is an endangered anatid of the Hawaiian Islands, currently restricted to an emergent atoll, Laysan Island. Laysan Island Lacks terrestrial mammalian predators, which permits the examination of mortality rates and causes without the anthropogenic effects of introduced predators. Mass and morphometrics were measured during the colour-marking of 297 Laysan Teat between 1998 and 2001. Intensive mark-resighting and recovery methods were used to estimate adult and juvenile mortality. One hundred and nineteen carcasses were collected on Laysan between 1998 and 2003, and systematic gross and microscopic examinations were undertaken on 63 of these. Causes of mortality were categorised as trauma, emaciation, miscellaneous or undetermined. Annual adult mortality rates were Low, 0.05-0.10 (s.e.

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